tim x biet:
x3 -5 =22
Tim X
a. 22/5:X=44/5:5/2
b. 8,35xX+6,65xX=45
a)\(\frac{22}{5}:x=\frac{44}{5}:\frac{5}{2}=\frac{44}{5}.\frac{2}{5}=\frac{84}{25}\)
\(\Rightarrow x=\frac{22}{5}:\frac{84}{25}=\frac{22}{5}.\frac{25}{84}=\frac{55}{42}\)
b) \(8,35x+6,65x=45\)
\(\Rightarrow\left(8,35+6,65\right)x=45\Rightarrow15x=45\)
\(\Rightarrow x=45:15=3\)
\(a,\frac{22}{5}\div x=\frac{44}{5}\div\frac{5}{2}\)
\(\Rightarrow\frac{22}{5}\div x=\frac{88}{25}\)
\(\Rightarrow x=\frac{5}{4}\)
\(b,8,35\times x+6,65\times x=45\)
\(\Rightarrow x\times\left(8,35+6,65\right)=45\)
\(\Rightarrow x\times15=45\)
\(\Rightarrow x=3\)
~Study well~
#Thạc_Trân
a) \(\frac{22}{5}:x=\frac{44}{5}:\frac{5}{2}\)
\(\frac{22}{5}:x=\frac{88}{25}\)
\(x=\frac{22}{5}:\frac{88}{25}\)
\(x=\frac{5}{4}\)
b) \(8,35.x+6,65.x=45\)
\(\left(8,35+6,65\right).x=45\)
\(15.x=45\)
\(x=45:15\)
\(x=3\)
- Dấu . là dấu nhân
TIM X
4/3-(25/100 x X-5/12)-22 x X
tim so nguyen x bt
x – 18 = 22 – 47
b) 4 2 – x = 53 – 60
c) 25 – 2x = 16 – 3x
d) x – (47 – 22) = 5+ (10 – 4x)
a) x- 18 = - 25
x =( -25 ) + 18
x = -7
b) 42 - x = 53 - 60
16 - x = 65
x = 16 - 65
x = -49
Tim x biet: x+1/1+2x+3/3+3x+5/5+...............+20x+39/9=22+4/3+6/5+................+40/39
Tim x ; y biet : a, (x-3)(y+2) = 5
b, xy-5x-5y= -22
a)(x-3)(y+2)=5
=5.1=1.5=-5.-1=-1.-5
=>x-3=5=>x=8=>y+2=1=>y=-1
x-3=1=>x=4=>y+2=5=>y=3
x-3=-5=>x=-2=>y+2=-1=>y=-3
x-3=-1=>x=2=>y+2=-5=>y=-7
vậy ta đc 4 cặp (x,y):(8,-1);(4,3);(-2,-3);(2,-7)
bn tính lại coi đúng ko,chứ cách làm thì mk làm đúng rùi nhưng kết quả thì mk tính nhẩm.
tim so nguyen x
a)2x - 5 = -11
b) 22 -(-x) = 12
a)2x - 5 = -11
\(2x=-11+5\)
\(2x=-6\)
\(x=-3\)
b) 22 -(-x) = 12
\(-x=22-12\)
\(-x=10\)
\(x=-10\)
học tốt
tim so nguyen x bt
25 – 2x = 16 – 3x
d) x – (47 – 22) = 5+ (10 – 4x) ai giup mik vs
25 – 2x = 16 – 3x
-2x + 3x = 16 - 25
x = -9
Vậy x = -9
x - (47 - 22 ) = 5 + (10-4x)
x - 47 + 22 = 5 + 10 - 4x
x + 4x = 5 + 10 - 22 + 47
5x = 40
x = 40 : 5
x = 8
Vậy x = 8.
~ HOK TỐT ~
\(\text{25 – 2x = 16 – 3x}\)
\(2x+3x=16-25\)
\(5x=-9\)
\(\Rightarrow x=\frac{-9}{5}\)
\(\text{d) x – (47 – 22) = 5+ (10 – 4x)}\)
\(x-47+22=5+10-4x\)
\(x+4x=5+10-22+47\)
\(5x=40\)
\(\Rightarrow x=8\)
học tốt
\(25-2x=16-3x\)
\(\Leftrightarrow25-2x-16=-3x\)
\(\Leftrightarrow-2x+9=-3x\)
\(\Leftrightarrow-3x+2x=9\)
\(\Leftrightarrow-x=9\Leftrightarrow x=9\)
Vậy ...
\(x-\left(47-22\right)=5+\left(10-4x\right)\)
\(\Leftrightarrow x-47+22=5+10-4x\)
\(\Leftrightarrow x-25=5+10-4x\)
\(\Leftrightarrow x-25=-4x+15\)
\(\Leftrightarrow x=-4x+15+25\)
\(\Leftrightarrow x=-4x+40\)
\(\Leftrightarrow x+4x=40\Leftrightarrow5x=40\Leftrightarrow x=8\)
Vậy ...
Tim so nguyen x , biet : 1 phan 6 = x phan 18 ; x phan 8 = -1 phan 4 ; 4 phan -5 = x phan 10 ; 11 phan 5 = -22 phan x ; x phan 8 = 8 phan x ; x phan -11 = -11 phan x
\(\frac{1}{6}=\frac{x}{18}\Rightarrow x=3\)
\(\frac{x}{8}=-\frac{1}{4}\Rightarrow x=-2\)
\(\frac{4}{-5}=\frac{x}{10}\Rightarrow x=-8\)
\(\frac{11}{5}=-\frac{22}{x}\Rightarrow x=-10\)
\(\frac{x}{8}=\frac{8}{x}\Rightarrow x^2=64\Rightarrow x=8\)
\(\frac{x}{-11}=-\frac{11}{x}\Rightarrow x^2=121\Rightarrow x=11\)
#H
Tim x :
2/x-1/+5=15
7x-14=3x=22
Ai lam xong dau tien thi minh tick cho nhe
2|x-1|+5=15
2|x-1|=15-5=10
|x-1|=10:2=5
nếu x-1=5 thì x=5+1=6
nếu x-1=-5 thì x=-5+1=-4
=> x=6 hoặc -4
b) 7x-14=3x+22 đề đúng như mk làm phải ko bạn
7x-3x=22+14
4x=36
x=36:4=9